EP0952750A3 - Channel search scheme for receivers in CDMA mobile communication systems - Google Patents

Channel search scheme for receivers in CDMA mobile communication systems Download PDF

Info

Publication number
EP0952750A3
EP0952750A3 EP19990302838 EP99302838A EP0952750A3 EP 0952750 A3 EP0952750 A3 EP 0952750A3 EP 19990302838 EP19990302838 EP 19990302838 EP 99302838 A EP99302838 A EP 99302838A EP 0952750 A3 EP0952750 A3 EP 0952750A3
Authority
EP
Grant status
Application
Patent type
Prior art keywords
search window
timing
received signal
detected signal
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19990302838
Other languages
German (de)
French (fr)
Other versions
EP0952750A2 (en )
Inventor
Lizhi Zhong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia of America Corp
Original Assignee
Nokia of America Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/004Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/005Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by adjustment in the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7075Synchronisation aspects with code phase acquisition
    • H04B1/70754Setting of search window, i.e. range of code offsets to be searched
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/08Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Abstract

A receiver scans through two different search windows to detect a received signal: a first search window and a second search window. The timing of the second search window is adjusted after every processing cycle to follow the detected signal, while the timing of the first search window remains fixed. If the timing of the detected signal remains relatively constant for a sufficient period of time, then the timing of both the first search window and the second search window are adjusted based on the timing of the most recently detected signal. In this way, the receiver can continue to detect the received signal, even when the timing of the received signal varies greatly over time, without necessarily changing the first search window. The present invention has particular applicability in a base station of an mobile telephony system, in which the time reference used by a mobile unit to transmit signals to the base station can change significantly over time. This may occur during periods of hand-off in which the time reference derived by the mobile unit can change greatly.
EP19990302838 1998-04-24 1999-04-13 Channel search scheme for receivers in CDMA mobile communication systems Withdrawn EP0952750A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US66510 1998-04-24
US09066510 US6526029B1 (en) 1998-04-24 1998-04-24 Search scheme for receivers in mobile communication systems

Publications (2)

Publication Number Publication Date
EP0952750A2 true EP0952750A2 (en) 1999-10-27
EP0952750A3 true true EP0952750A3 (en) 2001-10-04

Family

ID=22069959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990302838 Withdrawn EP0952750A3 (en) 1998-04-24 1999-04-13 Channel search scheme for receivers in CDMA mobile communication systems

Country Status (4)

Country Link
US (1) US6526029B1 (en)
EP (1) EP0952750A3 (en)
JP (1) JP2000031897A (en)
KR (1) KR19990083430A (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3387471B2 (en) * 2000-02-14 2003-03-17 日本電気株式会社 Path search method of spread spectrum communication system receiver and a spread spectrum communication
US6944143B1 (en) * 2000-03-31 2005-09-13 Qualcomm Incorporated Prioritization of searching by a remote unit in a wireless communication system
US7224719B1 (en) * 2000-03-31 2007-05-29 Qualcomm, Incorporated Fast acquisition of a pilot signal in a wireless communication device
DE60020610D1 (en) * 2000-06-05 2005-07-07 Linkair Comm Inc Reverse synschronisierungsverfahren in a wireless system
US7392045B2 (en) * 2002-01-15 2008-06-24 Marvell International Ltd. Method and apparatus for searching for a base station using an adaptable search window
US20040203420A1 (en) * 2002-04-10 2004-10-14 Rick Roland R. Method and apparatus for calculating a representative measurement from multiple data measurements
KR100732060B1 (en) * 2005-12-27 2007-06-19 엘지전자 주식회사 Mobile station with multiple action mode and it's method
US9374306B1 (en) 2009-03-04 2016-06-21 Sprint Spectrum L.P. Using packet-transport metrics for setting DRCLocks
US9467938B1 (en) 2009-04-29 2016-10-11 Sprint Spectrum L.P. Using DRCLocks for conducting call admission control
US8310929B1 (en) 2009-06-04 2012-11-13 Sprint Spectrum L.P. Method and system for controlling data rates based on backhaul capacity
US8249611B1 (en) 2009-10-02 2012-08-21 Sprint Spectrum L.P. Systems and methods for dynamically adjusting an access search window
US8355364B1 (en) 2009-10-02 2013-01-15 Sprint Spectrum L.P. Systems and methods for using topology to determine whether to grant an access request from an access terminal
US8761765B1 (en) 2010-01-13 2014-06-24 Sprint Spectrum L.P. Utilizing one or more search windows to capture both an earliest-received signal and a strongest received signal
US8363564B1 (en) 2010-03-25 2013-01-29 Sprint Spectrum L.P. EVDO coverage modification based on backhaul capacity
US8515434B1 (en) 2010-04-08 2013-08-20 Sprint Spectrum L.P. Methods and devices for limiting access to femtocell radio access networks

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459701A (en) * 1981-01-16 1984-07-10 Lignes Telegraphiques Et Telephoniques Process and device for synchronizing at reception digital signals transmitted in packages
US5229996A (en) * 1991-02-28 1993-07-20 Telefonaktiebolaget L M Ericsson Split-window time alignment
WO1996004716A1 (en) * 1994-07-29 1996-02-15 Qualcomm Incorporated Method and apparatus for performing code acquisition in a cdma communications system
US5598419A (en) * 1995-07-17 1997-01-28 National Semiconductor Corporation Dynamic synchronization code detection window

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5177765A (en) * 1991-06-03 1993-01-05 Spectralink Corporation Direct-sequence spread-spectrum digital signal acquisition and tracking system and method therefor
DE4319343A1 (en) * 1993-06-11 1994-12-15 Philips Patentverwaltung A method for determining the noise component in a video signal
US5530716A (en) * 1994-06-30 1996-06-25 Motorola, Inc. Method and apparatus for identifying a coded communication signal
US5710768A (en) * 1994-09-30 1998-01-20 Qualcomm Incorporated Method of searching for a bursty signal
US5907813A (en) * 1995-11-30 1999-05-25 Qualcomm Incorporated Signal acquisition in a wireless communication system by transmitting repeated access probes from a terminal to a hub
US5790589A (en) * 1996-08-14 1998-08-04 Qualcomm Incorporated System and method for rapidly reacquiring a pilot channel
US6094562A (en) * 1998-04-07 2000-07-25 Lucent Technologies Inc. Timing compensation for distant base station antennas in telecommunication systems
US6285876B1 (en) * 1998-04-07 2001-09-04 Lucent Technologies Inc. Test unit with programmable transmit timing for telecommunication systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459701A (en) * 1981-01-16 1984-07-10 Lignes Telegraphiques Et Telephoniques Process and device for synchronizing at reception digital signals transmitted in packages
US5229996A (en) * 1991-02-28 1993-07-20 Telefonaktiebolaget L M Ericsson Split-window time alignment
WO1996004716A1 (en) * 1994-07-29 1996-02-15 Qualcomm Incorporated Method and apparatus for performing code acquisition in a cdma communications system
US5598419A (en) * 1995-07-17 1997-01-28 National Semiconductor Corporation Dynamic synchronization code detection window

Also Published As

Publication number Publication date Type
KR19990083430A (en) 1999-11-25 application
JP2000031897A (en) 2000-01-28 application
EP0952750A2 (en) 1999-10-27 application
US6526029B1 (en) 2003-02-25 grant

Similar Documents

Publication Publication Date Title
US6078607A (en) Synchronization codes for use in communication
US20010021179A1 (en) Method and system for handoff between an asynchronous CDMA base station and a synchronous CDMA base station
US6263010B1 (en) Spread spectrum communication apparatus
US5907813A (en) Signal acquisition in a wireless communication system by transmitting repeated access probes from a terminal to a hub
US6785350B1 (en) Apparatus, and associated method, for detecting a symbol sequence
US6370397B1 (en) Search window delay tracking in code division multiple access communication systems
US6445728B1 (en) Method of establishing search window size for a mobile station in a cellular system
US7158505B2 (en) Periodic cell search
US20040052231A1 (en) Method and apparatus for indicating the presence of a wireless local area network by detecting signature sequences
US20040132443A1 (en) Search window delay tracking in code division multiple access communication systems
US20060030365A1 (en) Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver
JP2001166026A (en) Radio terminal position measuring method and terminal unit using the method and terminal position management office device
US20090280867A1 (en) Method and apparatus for processing random access bursts in a smart antenna system
US20050057395A1 (en) Method of determining the position of a target using transmitters of opportunity
US6973119B2 (en) Method and apparatus for recognizing a receiving path in a CDMA system
EP1035665A1 (en) Method for the initial synchronization of a digital mobile radio system
US6526029B1 (en) Search scheme for receivers in mobile communication systems
WO2001041482A1 (en) Synchronization of diversity handover destination base station
US20020105903A1 (en) Reception synchronization apparatus and demodulating apparatus using the same
US20080309543A1 (en) System and method for obtaining frequency and time synchronization in a wideband communication system
US6295290B1 (en) Telecommunications systems
US7599335B2 (en) Cell search process for wireless communication system
US6304759B1 (en) Method for extending the range of a wireless communication system
JP2001517892A (en) Mobile station assisted timing synchronization in Cdma communication system
US20100027526A1 (en) Efficient frame tracking in mobile receivers

Legal Events

Date Code Title Description
AX Request for extension of the european patent to

Free format text: AL;LT;LV;MK;RO;SI

AK Designated contracting states:

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

RIC1 Classification (correction)

Free format text: 7H 04Q 7/38 A, 7H 04B 7/26 B

AK Designated contracting states:

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent to

Free format text: AL;LT;LV;MK;RO;SI

AKX Payment of designation fees
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

18D Deemed to be withdrawn

Effective date: 20020405